Circuit-closer for fire-alarms.



F. W. SOST.

cmcun CLOSER FOR HRE ALARMS.

APPLICATION FILED AUG.29. 1914.

i FRANCIS W. BOST, 0F CHINA GROVE, NORTH CAROLINA.

CIRCUIT-CLOSER EOE FIRE-ALAEMS.

Specification of Letters Patent.

' ratenteasept. 14, reis.

Application filed August 29, 1914. Serial No. 859,238.

To all whom it may concern.'

Be it known that I, FRANCIS W. Bos'r, a citizen of the United States, residing at China Grove, in the county of Rowan and State of North Carolina, have invented a new and usef'ul Circuit-Closer for Fire Alarms; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to-which it appertains to make and use the saine,

This invention relates to a circuit closer for tire alarm systems, which is adapted for use in connection with the electrically operated annunciator as shown in the patent to F. W. Bost and B, Gobel, of October 3, 1911, Patent No. 1,004,946.

An object of the invention is the provision of a circuit closer having simple, efficient and practical features of construction.

yIn practical fields the details of construction may necessitate alterations, falling Within the Scope of what is claimed. y

The invention comprises further features and combination of parts, as hereinafter set forth, shown in the drawings and claimed.

ln the drawings :Figure 1 is a view of the improved circuit closer shown in use in connection with an aimunciator. a sectional view longitudinally through the circuit closer. Fig. 3 is a detail perspective view of the circuit closer showing the hood or cover removed. 'Figl 4 is a transverse sectional view on line et-l of Fig. 3.

Referring more particularly to the drawings, 1 designates a metallic plate, elongated,

and trough-shapedin cross section, and provided with laterally7 extending ears L), for the reception of screws El, whereby the circuit closer may be attached at any suitable location in a building. (lne end of the elongated plate is provided withscrew threaded apertures 1l, for the reception of screws G, which pass through the insiilating members 7, and also through the metallic sheet metal plate 8, which is provided with a binding Screw or terminal 9, for connecting a lead or wire 11. Soldered or otherwise connected to the Sheet metal plate 8 is a spi-ing blade Fig. 2 isV tongue 12 having a stilienin'g member 13,

soldered or otherwise iXed o'fi one face of the blade. This spring blade tongue is to be constructed of such metal suiliciently sensitive to cause the blade to'expand toward the bindingserew or terminal 15, that is, Y

owing to the intensity of the heat.v A wire or lead 16 is connected to the binding screw 15, which wire or lead in turnlias suitable connections with the annunciator. The binding screw. or termiilal 15 is threadedin the overhanging split arm 18 of the elongated plate 1. 'lhe casting or plate 1 adjacent saidlug or arm is provided with an opening, to permit the flame or the heat to pass therethrough 'and act upon. the tongue or blade,

to causel the same to expand toward the said screw.

On each side of the plate or casting 1 adjacent each end are indentures 19, to receive the projections 2O of the hood or cover 21. Said projections-are formed by indenting the sides of said hood or cover. By these projections and indentures the cover or hood is held securely in place.

The invention having been set forth, what is claimed as new anduseful is zln a. circuit closer, an elongated plate being grooved upon its under surface and hav ing an elongated opening at one end, the end having said opening having an arm iiitegral therewith rising upwardly and havf ing' a split portion overlying said opening, a lead terminal carried by said arm adjacent where the saine is integralwith the plate, a pair of insulating members secured to the other end of said plate, an expaiisible blade tongue consisting ot -two sections, one secured between said insulating member and provided with a lead terminal, the other section being connected to the section between the insulating members and provided with a stili'ening device, and an element threaded between the parts of the split portion of the arm to cooperate with the stili'- eiied section ot' the 'tongue and being adjustable whereby the tongue will act under different temperatures, said plate having cars extending laterally from its longitudinel aside, and n Skeleton @over pinta :1i-ching man he insulating mumbefi', tim cxpaiisibh:

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